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Theories of aging in describes aging from biological, physiological and psychosocial perspective and explain full life theories and mature life theories.
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“The link between genes and lifespan is unquestioned. The simple observation that some species live longer than others -- humans longer than dogs, tortoises longer than mice -- is one convincing piece of evidence.”
The National Institute on Aging
The Two Main Aging Theory Categories
Programmed Theories Aging has a biological timetable or internal biological clock. Error Theories Aging is a result of internal or external assaults that damage cells or organs so they can no longer function properly.
Many theories are a combination of programmed and error theories.
Programmed Theories
Programmed
Senescence Theory
Endocrine Theory
Immunology Theory
Wear and Tear Theory Rate-of-Living Theory Cross-linking Theory Free Radical Theory Error CatastropheTheory Somatic Mutation Theory
This is an extension of the “Hayflick Limit.”
Telomeres are specialized DNA sequences at the end
of chromosomes.
In the normal process of DNA replication, the end of the
chromosome is not copied exactly, which leaves an
unreplicated gap.